Robert Sean Leonard (Dr. James Wilson)

The 46-year-old recently appeared in a few episodes of TNT's Falling Skies and NBC's Law & Order: SVU. Starting in February of next year he'll be starring in the Off Broadway theatrical production of Prodigal Son.

He's married to Gabriella Salick and they have two kids together – Eleanor, 6, and Claudia, 3.

Kal Penn (Dr. Lawrence Kutner)

The 38-year-old is in the CBS series Battle Creek and will star in the upcoming Hulu series Deadbeat. He also has a handful of movies hitting theaters next year, including Going Under with Bruce Willis and John Goodman, and The Layover with Kate Upton.